/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
Like Extrude, but defaults to moving verts along vertex normals instead of a single direction.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=TriangleEdits, Meta=(DisplayName="Offset", DisplayPriority=1)) void Offset()